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In this case, you have asked a good question. In fact it is one i had trouble with when i started out.
Unfortunately i am an ASP/MSSQL/Access user, but it sounds like the same problem.
You have to check that the field in the database you are entering all this info into has the correct settings to accept it. In MSSQL Server we have datatypes 'Varchar', 'text' and 'ntext'. Trying to enter a long paragraph of text into a cell with varchar as the datatype just wont work. By default varchar only allows you to enter 250 characters (including spaces etc). However, doing the same with the text datatype works fine.
Normally, entering to much data into a field via a browser form will bring up a data error saying something along the lines of "datatype does not match, data will be truncated."
Again, not sure if this will help, but i would double check the settings of your Database fields to make sure they are set to accept large inputs of Data.
Webboy
When using the post method, there is no theoretical limit
to the amount of data that can be sent to the HTTP server. The
amount of data may be constrained by the physical limits of the
client computer.
So it sounds like something else is going on for you.